/*
 * Copyright 2008 The Apache Software Foundation Licensed under the Apache
 * License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law
 * or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

package org.apache.ibatis.ibator.generator.ibatis2.dao.elements;

import java.util.Set;
import java.util.TreeSet;

import org.apache.ibatis.ibator.api.IntrospectedColumn;
import org.apache.ibatis.ibator.api.dom.java.FullyQualifiedJavaType;
import org.apache.ibatis.ibator.api.dom.java.Interface;
import org.apache.ibatis.ibator.api.dom.java.JavaVisibility;
import org.apache.ibatis.ibator.api.dom.java.Method;
import org.apache.ibatis.ibator.api.dom.java.Parameter;
import org.apache.ibatis.ibator.api.dom.java.TopLevelClass;
import org.apache.ibatis.ibator.internal.util.JavaBeansUtil;

/**
 * @author Jeff Butler
 */
public class SelectByPrimaryKeyMethodGenerator extends
		AbstractDAOElementGenerator
{

	public SelectByPrimaryKeyMethodGenerator()
	{
		super();
	}

	@Override
	public void addImplementationElements(TopLevelClass topLevelClass)
	{
		Set<FullyQualifiedJavaType> importedTypes = new TreeSet<FullyQualifiedJavaType>();
		Method method = getMethodShell(importedTypes);

		// generate the implementation method
		StringBuilder sb = new StringBuilder();

		if (!introspectedTable.getRules().generatePrimaryKeyClass())
		{
			// no primary key class, but primary key is enabled. Primary
			// key columns must be in the base class.
			FullyQualifiedJavaType keyType = new FullyQualifiedJavaType(
					introspectedTable.getBaseRecordType());
			topLevelClass.addImportedType(keyType);

			sb.setLength(0);
			sb.append(keyType.getShortName());
			sb.append(" key = new "); //$NON-NLS-1$
			sb.append(keyType.getShortName());
			sb.append("();"); //$NON-NLS-1$
			method.addBodyLine(sb.toString());

			for (IntrospectedColumn introspectedColumn : introspectedTable
					.getPrimaryKeyColumns())
			{
				sb.setLength(0);
				sb.append("key."); //$NON-NLS-1$
				sb.append(JavaBeansUtil.getSetterMethodName(introspectedColumn
						.getJavaProperty()));
				sb.append('(');
				sb.append(introspectedColumn.getJavaProperty());
				sb.append(");"); //$NON-NLS-1$
				method.addBodyLine(sb.toString());
			}
		}

		FullyQualifiedJavaType returnType = method.getReturnType();

		sb.setLength(0);
		sb.append(returnType.getShortName());
		sb.append(" record = ("); //$NON-NLS-1$
		sb.append(returnType.getShortName());
		sb.append(") "); //$NON-NLS-1$
		sb.append(daoTemplate.getQueryForObjectMethod(
				introspectedTable.getIbatis2SqlMapNamespace(),
				introspectedTable.getSelectByPrimaryKeyStatementId(), "key")); //$NON-NLS-1$
		method.addBodyLine(sb.toString());
		method.addBodyLine("return record;"); //$NON-NLS-1$

		if (ibatorContext.getPlugins().daoSelectByPrimaryKeyMethodGenerated(
				method, topLevelClass, introspectedTable))
		{
			topLevelClass.addImportedTypes(importedTypes);
			topLevelClass.addMethod(method);
		}
	}

	@Override
	public void addInterfaceElements(Interface interfaze)
	{
		Set<FullyQualifiedJavaType> importedTypes = new TreeSet<FullyQualifiedJavaType>();
		Method method = getMethodShell(importedTypes);
		addMethodComment(method, "get pojo");
		if (ibatorContext.getPlugins().daoSelectByPrimaryKeyMethodGenerated(
				method, interfaze, introspectedTable))
		{
			interfaze.addImportedTypes(importedTypes);
			interfaze.addMethod(method);
		}
	}

	private Method getMethodShell(Set<FullyQualifiedJavaType> importedTypes)
	{
		Method method = new Method();
		method.setVisibility(JavaVisibility.PUBLIC);

		FullyQualifiedJavaType returnType = introspectedTable.getRules()
				.calculateAllFieldsClass();
		method.setReturnType(returnType);
		importedTypes.add(returnType);

		method.setName(getDAOMethodNameCalculator()
				.getSelectByPrimaryKeyMethodName(introspectedTable));

		if (introspectedTable.getRules().generatePrimaryKeyClass())
		{
			FullyQualifiedJavaType type = new FullyQualifiedJavaType(
					introspectedTable.getPrimaryKeyType());
			importedTypes.add(type);
			method.addParameter(new Parameter(type, "id")); //$NON-NLS-1$
		}
		else
		{
			for (IntrospectedColumn introspectedColumn : introspectedTable
					.getPrimaryKeyColumns())
			{
				FullyQualifiedJavaType type = introspectedColumn
						.getFullyQualifiedJavaType();
				importedTypes.add(type);
				method.addParameter(new Parameter(type, introspectedColumn
						.getJavaProperty()));
			}
		}

		for (FullyQualifiedJavaType fqjt : daoTemplate.getCheckedExceptions())
		{
			method.addException(fqjt);
			importedTypes.add(fqjt);
		}

		ibatorContext.getCommentGenerator().addGeneralMethodComment(method,
				introspectedTable);

		return method;
	}
}
